The strongest grade 9 bolt on the market. Foremost Threaded Product's F-911 hex head grade 9 bolts are zinc plated, USA made, and 180,000psi minimum strength. This bolt is at least 20% stronger than the best grade 8 bolt on the market. Whether you're racing or a recreational driver, this bolt will surpass your greatest expectations. Now with 8640 Alloy Steel.